Zig-zag sewing machine



July 3, 1951 J JQCSAK ETAL 2,559,438

ZIG-ZAG SEWING MACHINE Filed April 15, 1949 2 Sheets-Sheet 1 0 /6 o w 0 I. I /8 o a 8 Wu]! 7) V g 9 7 j- 8 I 0 1 Q. g

J Jbc's 4 JZZZF'aw J INVENTORsv ATTORNEYS y 3, 1951 J. JOCSAK Em 2,559,438

ZIG-ZAG SEWING MACHINE Filed April 15, 1949 2 Sheets-Sheet 2 Q7. Wcwak EJFFaw INVENTORS f BY 3 1 mm I 4 s ATTORNEYS Patented July 3, 1951 ZIG-ZAG SEWING MACHINE John J ocsak, Easton, and Howard F. Fox, Bethlehem, Pa.

Application April 15, 1949, Serial No. 87,727

This invention relates to an oscillating needle head for sewing machines.

By wa of background, it may be observed that it is not new per se to oscillate the needle head of a sewing machine for the purpose of producing zig-zag stitching.

An important object of the present invention, however, is to provide an oscillating needle head construction wherein, in combination with the individual zig-zag stitches, the entire line of stitching will be given a scalloped or serpentine effect.

Another important object is to provide a construction which will produce the results set forth immediately above, and which will nevertheless keep the scallops of the line of stitching continuously uniform and of even pitch, and which will also keep the individual stitches of regular and uniform length.

Another important object is to provide a. construction as described in which the needle head construction can be embodied in a zig-zag type of sewing machine such as the Singer Machine, Model '7Wl, without any more than minor changes, being made in the basic construction of said machine.

Another important object is to provide a construction as described in which the needle head arrangement can be provided as an attachment for a machine of the type specified above.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings Fig. 1 is a side elevational view of the invention, as applied to a well-known zig-zag stitch sewing machine.

3 Claims. (Cl. 112-158) Fig, 2 is a side elevation, portions being broken mercial type known as the Singer Machine, Model 107W1, and this can be considered as a supporting frame for the invention.

Mounted for rotation on one side of the supporting frame 5 is the small drive sprocket 6,

receiving its power from any suitable source, not shown. Around the drive sprocket 6 passes the chain 7 that also passes around the large driven sprocket 8 keyed at 9 on stub shaft I0 journaled for rotation in supporting frame 5.

The key 9 also secures to the shaft I0 for rotation therewith the drive gear II that is in mesh with the driven gear 12 mounted on one end of the shaft i3 that is journaled for rotation in the supporting frame 5, said gear [2 rotating the shaft 13 so as to rotate an eccentric I4 secured to the opposite end of the shaft and rotating in a recess [5 formed in the supporting frame 5.

Projecting from the marginal portion of the eccentric I4 is the eccentrically disposed pin l6 that extends into a vertical groove I! formed in the inner face of the enlarged upper end l8 of a needle head l9. Adjacent its lower end needle head i9 is integrally formed with a lateral projection 20 formed with a closed laterally extended slot 2| through which extends screw 22 threaded into the supporting frame 5, said screw comprising a pivot for the needle head Hi.

It will be seen, therefore, that when the eccentric I4 is rotated, the upper end I8 of the needle head will be oscillated. Pivoting on the pivot 22, the needle head l9 Will be given oscillating movement so that the needle N at the lower end of said needle head will be given oscillating movement, At 23 we have shown a disc mounted on and rotating with the shaft 24, said shaft 24 being the shaft that carries the small drive sprocket t. Pivotally connected at one end to the disc 23 is the oscillating arm 25, that is pivotally connected at its opposite end as at 26 to a laterally extended boss 2i, said pivotal connection 26 being disposed in a line with the longitudinal center line of the slot 2 I.

Mounted for up and down sliding movement on the needle head I?! is the arm 28 that carries the needle N, said arm 28 reciprocating in sleeve 29 formed integrally with the needle head It, and also in collar 30 that is movably mounted on the supporting frame 5.

It may now be noted that disc 23 would rotate at comparatively high speed, since it is driven directly from the driving means used to power the sewing machine.

This in turn will cause high speed oscillation of the needle N so as to produce zig-zig stitches A shown in Figure 6. Said high speed oscillation of the needle N is permitted by reason of the closed slot 2i, as readily seen from Figure l.

The needle arm 28, of course, is given up and down sliding movement at high speed in the needle head i9, for the purpose of stitching the cloth or other material, this being accomplished in the regular manner by suitable mechanism, not shown.

At the same time that the needle N is being given high speed oscillation to produceshortrzig zag stitches A of uniform length, it is being given low speed oscillation over a much wider path the limits of which are shown by the imaginary lines B, C, of Figure 6. This is accomplished by osits ends a lateral slot, a pin extending through the slot and secured to the supporting frame to provide a pivotal connection of the head to the frame on which the head can slide laterally, a highspeed short-stroke oscillating means carried by the frame and connected to the needle head to shift the head slidably upon said pin and thereby position the needle for zig-zag stitches, and a lowspeed long-stroke oscillating means mounted on the frame and connected to the upper end of the needle head to rock said needle head pivotally about the pin and thereby locate said stitches ,7 in a zig-zag path.

' through said slot and secured to the supporting cillating pivotal movement of the needle head I?! accomplished as described hereinbefore, with the needle head is pivoting on the pin or screw 22.

This low speed oscillation is achieved by the reduction gearing shown in the drive means illustrated in Figure 2, and produces the uniform and even scalloped line of stitching illustrated in Figure 6, in which line of stitching are provided the continuously uniform small zig-zag stitches A.

What is caimed is:

1. In a sewing machine the combination with a supporting frame of a needle head having a needle at its lower end and having a pivotal connection intermediate its ends to the supporting frame, said needle head having lateral sliding movement on said connection, means mounted on said frame and connected to the upper end of the needle head for imparting swinging movement to the needle head about said pivotal connection, and means on the supporting frame separate from the first means for imparting lateral slidable movement to the needle head on said connection, whereby to give the needle head independent but simultaneously occurring movements in which, respectively, it is continuously oscillated backwardly and forwardly and reciprocated laterally during said oscillating movement to form zig-zag stitches while being oscillated. 2. The combination with a supporting frame of a sewing machine of a needle head having a needle at its lower end and having intermediate frame to provide a pivotal connection of the head to the frame on which the head slides laterally, a high-speed short-stroke pitman mounted upon the supporting frame and connected at one end to the needle head in a line with the longitudinal center line of the slot, to reciprocate the lower end of the needle head laterally at high speed and through a short distance by sliding oi the head on the pin, thus to position the needle to make Zig-zag stitches, and a pin mounted on the supporting frame to travel through a circular path at low speed, the needle head having at its upper end a longitudinal slot in which said last-named pin is engaged, thus to provide lowspeed oscillation of the lower end of the needle head by pivotal swinging of the lower end of the needle head about the first-named pin responsive to travel of the second-named pin through a circular path, thereby to locate said stitches along a zig-Zag path.

JOHN JOOSAKJ HOWARD F. FOX.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 875,628 Parkes Dec. 31, 1907 2,216,096 Card Sept. 24, 1940 2,365,222 Sigoda Dec. 19, 1944 

